'American Idol' contestant lost 70 pounds since starting the competition

On American IdolSunday night, top 24 contestant Caleb Lee Hutchinson got a surprise visit from his favorite past Idol, season 10 winner Scotty McCreery, who stopped in to give him some Idol advice.

"You know, the thing about country music is it's all about the song, you know, at the core of it. So, you can think about that when you're making your song choices for 'Idol' each week. Think about what's gonna relate to people back home. But just enjoy it. Take time for yourself to take a breather, 'cause it's gonna get wild. But I'm sure you'll do great," McCreery told Hutchinson.

The song Hutchinson chose to sing for his solo round was Thomas Rhett's "Die a Happy Man." However, the judges weren't totally blown away by his performance. In fact, country artist and judge Luke Bryan told Hutchinson, "I wouldn't say that was the best song for you that we've heard you do. I mean, when you did the Josh Turner song, that was right in your wheelhouse. Just keep delivering your style, but also, you know, dig in." Bryan also told him that parts of his performance were a little "pitchy," while Katy Perry described the end of his performance as "a little shaky."

Hutchinson's performance may not have stunned, but he did impress everyone with a noticeably lighter physical appearance. 70 pounds lighter, to be exact. And when host Ryan Seacrest pointed out how much weight he has lost since his first audition, and Bryan asked him what he did, Caleb hilariously shared, "One day I was like, 'Hey, wouldn't it be cool if, like, I drank water and walked every night?' The more the Instagram picture likes went up, the more I wanted to hit the treadmill."